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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/cmsis/TARGET_NORDIC/TARGET_MCU_NRF51822/system_nrf51822.c@395:bfce16e86ea4, 2014-11-10 (annotated)

Committer:
mbed_official
Date:
Mon Nov 10 07:45:06 2014 +0000
Revision:
395:bfce16e86ea4
Parent:
308:29bf8b44dbf6
Child:
459:397407b8d9f7
Synchronized with git revision 8adfd82aa1bf8859ec08537ee7bcd4aaaec1769b



Full URL: https://github.com/mbedmicro/mbed/commit/8adfd82aa1bf8859ec08537ee7bcd4aaaec1769b/



Targets: LPC176X - Add repeater pinmode

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 85:e1a8e879a6a9 1 /* mbed Microcontroller Library
mbed_official 85:e1a8e879a6a9 2
mbed_official 104:a6a92e2e5a92 3 * Copyright (c) 2013 Nordic Semiconductor.
mbed_official 85:e1a8e879a6a9 4 *
mbed_official 85:e1a8e879a6a9 5 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 85:e1a8e879a6a9 6 * you may not use this file except in compliance with the License.
mbed_official 85:e1a8e879a6a9 7 * You may obtain a copy of the License at
mbed_official 85:e1a8e879a6a9 8 *
mbed_official 85:e1a8e879a6a9 9 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 85:e1a8e879a6a9 10 *
mbed_official 85:e1a8e879a6a9 11 * Unless required by applicable law or agreed to in writing, software
mbed_official 85:e1a8e879a6a9 12 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 85:e1a8e879a6a9 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 85:e1a8e879a6a9 14 * See the License for the specific language governing permissions and
mbed_official 85:e1a8e879a6a9 15 * limitations under the License.
mbed_official 85:e1a8e879a6a9 16 */
mbed_official 85:e1a8e879a6a9 17
mbed_official 85:e1a8e879a6a9 18
mbed_official 85:e1a8e879a6a9 19 #include <stdint.h>
mbed_official 85:e1a8e879a6a9 20 #include <stdbool.h>
mbed_official 85:e1a8e879a6a9 21 #include "nrf51822.h"
mbed_official 85:e1a8e879a6a9 22 #include "system_nrf51822.h"
mbed_official 85:e1a8e879a6a9 23
mbed_official 85:e1a8e879a6a9 24
mbed_official 306:d33324c3b5a2 25 #define __SYSTEM_CLOCK (16000000UL) /*!< nRF51 devices use a fixed System Clock Frequency of 16MHz */
mbed_official 85:e1a8e879a6a9 26
mbed_official 85:e1a8e879a6a9 27 static bool is_manual_peripheral_setup_needed(void);
mbed_official 85:e1a8e879a6a9 28 static bool is_disabled_in_debug_needed(void);
mbed_official 85:e1a8e879a6a9 29
mbed_official 85:e1a8e879a6a9 30
mbed_official 85:e1a8e879a6a9 31 #if defined ( __CC_ARM )
mbed_official 304:89b9c3a9a045 32 uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK;
mbed_official 85:e1a8e879a6a9 33 #elif defined ( __ICCARM__ )
mbed_official 85:e1a8e879a6a9 34 __root uint32_t SystemCoreClock = __SYSTEM_CLOCK;
mbed_official 85:e1a8e879a6a9 35 #elif defined ( __GNUC__ )
mbed_official 85:e1a8e879a6a9 36 uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK;
mbed_official 85:e1a8e879a6a9 37 #endif
mbed_official 85:e1a8e879a6a9 38
mbed_official 85:e1a8e879a6a9 39 void SystemCoreClockUpdate(void)
mbed_official 85:e1a8e879a6a9 40 {
mbed_official 85:e1a8e879a6a9 41 SystemCoreClock = __SYSTEM_CLOCK;
mbed_official 85:e1a8e879a6a9 42 }
mbed_official 85:e1a8e879a6a9 43
mbed_official 85:e1a8e879a6a9 44 void SystemInit(void)
mbed_official 304:89b9c3a9a045 45 {
mbed_official 306:d33324c3b5a2 46 /* If desired, switch off the unused RAM to lower consumption by the use of RAMON register.
mbed_official 306:d33324c3b5a2 47 It can also be done in the application main() function. */
mbed_official 306:d33324c3b5a2 48
mbed_official 85:e1a8e879a6a9 49 // Prepare the peripherals for use as indicated by the PAN 26 "System: Manual setup is required
mbed_official 85:e1a8e879a6a9 50 // to enable the use of peripherals" found at Product Anomaly document for your device found at
mbed_official 304:89b9c3a9a045 51 // https://www.nordicsemi.com/. The side effect of executing these instructions in the devices
mbed_official 85:e1a8e879a6a9 52 // that do not need it is that the new peripherals in the second generation devices (LPCOMP for
mbed_official 85:e1a8e879a6a9 53 // example) will not be available.
mbed_official 306:d33324c3b5a2 54 if (is_manual_peripheral_setup_needed())
mbed_official 306:d33324c3b5a2 55 {
mbed_official 85:e1a8e879a6a9 56 *(uint32_t volatile *)0x40000504 = 0xC007FFDF;
mbed_official 85:e1a8e879a6a9 57 *(uint32_t volatile *)0x40006C18 = 0x00008000;
mbed_official 85:e1a8e879a6a9 58 }
mbed_official 304:89b9c3a9a045 59
mbed_official 85:e1a8e879a6a9 60 // Disable PROTENSET registers under debug, as indicated by PAN 59 "MPU: Reset value of DISABLEINDEBUG
mbed_official 304:89b9c3a9a045 61 // register is incorrect" found at Product Anomaly document four your device found at
mbed_official 304:89b9c3a9a045 62 // https://www.nordicsemi.com/. There is no side effect of using these instruction if not needed.
mbed_official 306:d33324c3b5a2 63 if (is_disabled_in_debug_needed())
mbed_official 306:d33324c3b5a2 64 {
mbed_official 85:e1a8e879a6a9 65 NRF_MPU->DISABLEINDEBUG = MPU_DISABLEINDEBUG_DISABLEINDEBUG_Disabled << MPU_DISABLEINDEBUG_DISABLEINDEBUG_Pos;
mbed_official 85:e1a8e879a6a9 66 }
mbed_official 304:89b9c3a9a045 67
mbed_official 304:89b9c3a9a045 68 // Start the external 32khz crystal oscillator.
mbed_official 308:29bf8b44dbf6 69
mbed_official 308:29bf8b44dbf6 70 #ifdef TARGET_HRM1017
mbed_official 308:29bf8b44dbf6 71 NRF_CLOCK->LFCLKSRC = (CLOCK_LFCLKSRC_SRC_RC << CLOCK_LFCLKSRC_SRC_Pos);
mbed_official 308:29bf8b44dbf6 72 #else
mbed_official 304:89b9c3a9a045 73 NRF_CLOCK->LFCLKSRC = (CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos);
mbed_official 308:29bf8b44dbf6 74 #endif
mbed_official 304:89b9c3a9a045 75 NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
mbed_official 304:89b9c3a9a045 76 NRF_CLOCK->TASKS_LFCLKSTART = 1;
mbed_official 85:e1a8e879a6a9 77
mbed_official 85:e1a8e879a6a9 78 // Wait for the external oscillator to start up.
mbed_official 304:89b9c3a9a045 79 while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0) {
mbed_official 85:e1a8e879a6a9 80 // Do nothing.
mbed_official 85:e1a8e879a6a9 81 }
mbed_official 85:e1a8e879a6a9 82 }
mbed_official 85:e1a8e879a6a9 83
mbed_official 304:89b9c3a9a045 84 static bool is_manual_peripheral_setup_needed(void)
mbed_official 85:e1a8e879a6a9 85 {
mbed_official 85:e1a8e879a6a9 86 if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0))
mbed_official 85:e1a8e879a6a9 87 {
mbed_official 85:e1a8e879a6a9 88 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x00) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
mbed_official 85:e1a8e879a6a9 89 {
mbed_official 85:e1a8e879a6a9 90 return true;
mbed_official 85:e1a8e879a6a9 91 }
mbed_official 85:e1a8e879a6a9 92 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x10) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
mbed_official 85:e1a8e879a6a9 93 {
mbed_official 85:e1a8e879a6a9 94 return true;
mbed_official 85:e1a8e879a6a9 95 }
mbed_official 85:e1a8e879a6a9 96 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x30) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
mbed_official 85:e1a8e879a6a9 97 {
mbed_official 85:e1a8e879a6a9 98 return true;
mbed_official 85:e1a8e879a6a9 99 }
mbed_official 85:e1a8e879a6a9 100 }
mbed_official 304:89b9c3a9a045 101
mbed_official 85:e1a8e879a6a9 102 return false;
mbed_official 85:e1a8e879a6a9 103 }
mbed_official 85:e1a8e879a6a9 104
mbed_official 304:89b9c3a9a045 105 static bool is_disabled_in_debug_needed(void)
mbed_official 85:e1a8e879a6a9 106 {
mbed_official 85:e1a8e879a6a9 107 if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0))
mbed_official 85:e1a8e879a6a9 108 {
mbed_official 85:e1a8e879a6a9 109 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x40) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
mbed_official 85:e1a8e879a6a9 110 {
mbed_official 85:e1a8e879a6a9 111 return true;
mbed_official 85:e1a8e879a6a9 112 }
mbed_official 85:e1a8e879a6a9 113 }
mbed_official 304:89b9c3a9a045 114
mbed_official 85:e1a8e879a6a9 115 return false;
mbed_official 85:e1a8e879a6a9 116 }
mbed_official 85:e1a8e879a6a9 117